Or search: humorous, ludicrous, humourous, ridiculous
3 Syllables: SUU
arsenal, article, cardinal, carnival, chargeable, marginal, particle
4 Syllables: USUU
monarchical, remarkable
5 Syllables: UUSUU
categorical, hierarchical

Found 11 words across 3 groupings. Skipped 5 excess words of a similar stem.